HMS-8 #3

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# The form data below was edited by tom_tyler
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Job:	HMS-8

Status:	open

Project:	perforce_software-hms

Severity:	B

ReportedBy:	tom_tyler

ReportedDate:	2020/03/29 10:11:30

ModifiedBy:	tom_tyler

ModifiedDate:	2020/10/06 06:34:51

OwnedBy:	tom_tyler

Description:
	Support HMS automated failover using 'p4 failover' command.
	
	Original title was: Support HMS automated failover of 'standby'
	(journalcopy) replica.
	
	HMS supports failover of a forwarding replica, but not a
	forwarding 'standby' replica that uses journalcopy.
	
	The mkrep.sh script knows the details of creating a replica
	designated as 'ha' (High Availability) or 'ham' (metadata-only
	variant of 'ha').  Replicas with these tags are sutiable for
	use with the 'p4 failover' command, which implies many thing:
	* The Services in server spec is 'standby' or 'forwarding-standby'
	* The rpl.journalcopy.location=1 is set.
	* They are creatd with P4D >= 2018.2, and have the ReplicatinFrom
	field in the server spec set.
	* Their journalPrefix matches the master.
	
	This will need to support a preflight of failover, using 'p4 failover'
	without the '--yes' flag.
	
	We will also want to drop support for other forms of failover, to
	ensure best results. It is TBD whether that will be done as part
	of implementing this job.

DevNotes:
	This job, HMS-8, was once SDP-204.

Component:	fo

Type:	Feature
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